For minority carrier lifetime, mono silicon is an order of magnitude higher than poly silicon.

Mono-C-Si module generates less heat than poly-c-Si modules, because the carrier recombination, which converts electricity to heat, is less in mono cells than in poly cells.
Therefore, the nominal operating cell temperature (NOCT) for mono cell is less than poly cell, in other words, the mono-module works at a lower temperature which leads to more energy generation.